<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8"/>
    <title>2-1 标签选择器</title>
    <style>
        body {
            background-color: red;
        }

        h2 {
            color: yellow;
        }
    </style>
</head>
<body>
<h2>我爱我的祖国</h2>
</body>
</html>
